> That's only because they're greedy
No, it's because Canon didn't sell OP a webcam. There's no expectation for them to provide webcam software.
If someone wants an external camera that doubles as a webcam with no adapters, that's totally fine for them! They should shop with that in mind.
Nothing about this is deceptive or a violation of consumer rights. Far from it.
This is common for cameras. My Sony works in the same way. It can be used as a webcam using HDMI and a capture card. Canon clearly states this in their marketing for OP's camera.
OP apparently didn't understand this, but the solution is simple -- get an HDMI cable and a capture card.
OP bought a camera, and the camera can be used as a webcam - but deliberately not with standard protocols. Pretending the limitation is of technical nature rather than a result of corporate greed is both delusional and harmful to consumer rights.